Clamp for testing sheering property of continuous fiber reinforced composite material
A technology of reinforced composite materials and continuous fibers, which is applied in the direction of testing the strength of materials, analyzing materials, and strength characteristics by applying stable shear force. It can solve the problems of large error in test results, small use range of fixtures, and short life. The effect of improving fixture life, saving test cost and reducing influence
Inactive Publication Date: 2011-03-16
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a fixture for testing the shear performance of continuous fiber reinforced composite materials, which can solve the problems of using different fixtures at room temperature and high temperature, large error in test results, small use range of the fixture, and long service life. short question
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[0025] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0026] This embodiment is used to test 2D-C f / SiC composite material high temperature interlaminar shear performance, it is said that the sample size to be tested is 30×15×3.
[0027] The structure of this embodiment see figure 1 : including an upper pressing head 1, a lower clamp 6 and a serrated trapezoidal block 7.
[0028] The upper indenter 1 is made of superalloy material, and the structure of the upper indenter 1 is shown in figure 2 , using a cuboid structure with arc surfaces on both sides and a T-shaped slot. Insert the upper pressure head gasket 2 in the T-shaped groove, and adopt wear-resistant SiC ceramic material. Upper pressure head gasket 2 see image 3 , The upper indenter gasket 2 has the same thickness as the upper indenter, and is a T-shaped block that matches the T-shaped groove.
[0029] See lower fixture 6 Figure 4 , Figure 5 , ...
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Abstract
The invention relates to a clamp for testing sheering property of continuous fiber reinforced composite material, which has the technical characteristics that an upper pressure head is T-shaped structure; a T-shaped upper pressure head spacer slot is arranged in the upper pressure head, and an upper pressure head spacer is arranged in the spacer slot; a lower clamp is in a cuboid structure whose two sides have circular arc surfaces, and one of two sides is provided with a thermocouple patchhole; the middle of the cuboid structure is a through hole whose lower end is provided with a rectangle spacer slot in which a lower clamp spacer whose thickness is equal to that of the lower clamp is arranged; the other side relative to the thermocouple patchhole is provided with an inclined plane abutting on a serrated trapezium block which is inserted at the position of the inclined plane in the lower clamp, and the serrated inclined plane and the inclined plane of the lower clamp inosculate; thelower arc surface of the pressure head and the inner circular arc surface of the lower clamp use clearance fit. The influence of flexible effect to a test result is reduced when the clamp of the invention is adopted for testing, which makes the test result closer to the real sheering intensity of the reinforced composite material.
Description
technical field [0001] The invention relates to a fixture for testing the shear performance of continuous fiber-reinforced composite materials, which can be applied to test the interlayer and in-plane shear strength of continuous fiber-reinforced composite materials under high temperature and room temperature conditions. Background technique [0002] The shear performance of materials is one of the most basic properties for evaluating materials. There are many existing experimental methods for testing the shear strength of composite materials, mainly including: short beam method; double notch method; V-shaped notch method. Each test method has its own shortcomings, but the most widely used are the American ASTM C1425-05 (high temperature) and ASTM C1292-00 (room temperature) standards, which are the double-notch (DNS) test method. [0003] The documents "ASTM C1292-00 and ASTM C1425-05 Standards" respectively introduce a fixture for testing the shear properties of composite...
Claims
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IPC IPC(8): G01N3/04G01N3/24
Inventor 张程煜乔生儒严科飞韩栋张歌李玫
Owner NORTHWESTERN POLYTECHNICAL UNIV